Ford TRANSIT 2015 Owner's Manual page 249

Incorrect or inadequate vehicle
maintenance can cause tires to
wear abnormally. Inspect all the
tires, including the spare,
frequently, and replace them if
one or more of the following
conditions exist:
Tire Wear
E142546
When the tread is worn down to
0.08 in (2 mm), tires must be
replaced to help prevent your
vehicle from skidding and
hydroplaning. Built-in treadwear
indicators, or wear bars, which
look like narrow strips of smooth
rubber across the tread will
appear on the tire when the tread
is worn down to 0.08 in (2 mm).
When the tire tread wears down
to the same height as these wear
bars, the tire is worn out and must
be replaced.
Transit (TTH) Canada/United States of America, enUSA, Edition date: 03/2014
Wheels and Tires
Tire Damage
Periodically inspect the tire treads
and sidewalls for damage, for
example bulges in the tread or
sidewalls, cracks in the tread
groove or separation in the tread
or sidewall. If damage is observed
or suspected have the tire
inspected by a tire professional.
Tires can be damaged during
off-road use, so inspection after
off-road use is also
recommended.
Tire Age
for example weather, storage
conditions, and conditions of use,
for example load, speed and
inflation pressures the tires
experience throughout their lives.
In general, tires should be
replaced after six years regardless
of tread wear. However, heat
caused by hot climates or
frequent high loading conditions
can accelerate the aging process
and may require tires to be
replaced more frequently.
You should replace the spare tire
when you replace the road tires or
after six years due to aging even if
it has not been used.
246
WARNING
Tires degrade over time
depending on many factors,